The major clinical reason is there are so few 1, jaw, jaw disharmony that is when you bite on the jaw with a high point or the phenomenon is not correct, 2, psychological factors due to mental stress, relax the mind does not result in 3, systemic factors such as roundworm Disease 4, some professional career professionals that affect the particular job requirements for this high precision work such as clock work, hope to the hospital for closer examination, temporomandibular joint disorder sometimes can cause this symptom, due early hospital Check
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